Where can I get online test on probability theory?

Hello!
Tell me the websites on which you could pass a test on probability theory and mathematical statistics, to identify gaps in those subjects.
July 8th 19 at 12:16
1 answer
July 8th 19 at 12:18
I have these sites have not seen, but usually books are added exercises at the end of the paragraph. In the book J. S. Brodsky "Statistics. Probability. Combinatorics" good exercise and more

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